Population in India has been increasing continuously.
Due to this increase in population demand for water has increased in all the spheres.
Demand for water has increased comparatively more for drinking, irrigation and industries.
On the other hand, per capita annual availability of water has been decreasing continuously.
In 1951 per capita annual availability of water was 5177 cubic metre per person which has decreased to 1829 cubic metre per person annually in 2001.
In the coming years by 2025 per capita availability of water is expected to become 1342 cubic metres annually.
It is to be noted that the water crisis arises when the per capita availability of water falls 1000 cubic metres annually.
India is an agricultural country.
Hence plenty of water is needed for irrigation.
536 billion cubic metre. water was used for irrigation in the year 2000. It is 81 percent of the total water used.
The remaining percentage of water was used for domestic, industrial and other purposes.
There has been a rapid increase in the irrigated area in India since independence.
Total irrigated areas in 1999-2000 was 8.47 crore hectare.
The demand for irrigation in India has been increasing continuously.
The reasons for the increasing demand of irrigation are as follow –
 Regional and seasonal variations in the distribution of rainfall.
 Wide and uncertain gaps in rainfall season.
 Growing demand of water for commercial crops.
 Changing cropping pattern.